| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna system wherein a feed element and a parasitic element are coaxially arranged with a simple configuration so as to reduce the cost. SOLUTION: A support mount seat 2 is screw-fastened to a tip of an antenna support 1, and an insulation pole 4 is screw-fastened to its upper end via a support plate 3, a lower feeding element 5b is mounted on an upper end inner side face of the insulation pole 4, an element hold plate 12 is mounted on its upper end and an insulation plate 14 and a connection plate 15 are screw-fastened. An upper feeding element 5a is mounted onto the connection plate 15 and a support 20 via an element hold plate 13, a short trap circuit 16 is provided to a center shaft of the lower feeding element 5b to feed power to the feeding elements 5a, 5b. An antenna cover 23 is provided to the outside of the insulation pole 4 and the feeding elements 5a, 5b and its lower end is screw-fastened to the support mount seat 2. A parasitic element 8 is mounted on an outer circumferential face of the antenna cover 23 and placed coaxially with respect to the feeding elements 5a, 5b. COPYRIGHT: (C)2004,JPO
|
